surcingle

The duke was an old man, of a girth so enormous that he was obliged to wear a broad surcingle as support to his rotund paunch.

From Told by the Death's Head A Romantic Tale by M?r J?kai

The girth and surcingle are of leather, with an ordinary woolen saddle-blanket.

From The Prairie Traveler A Hand-book for Overland Expeditions by Randolph Barnes Marcy

George now unloosened the long reins which were attached to the heavy surcingle, and after walking the animal two or three times round the circle, suffered him to go free.

From That Boy Of Norcott's by Charles James Lever

As a saddle swings around on anything but a horse, it is easier to ride bulls and mules with a surcingle.

From Unexplored! by Allen Chaffee

When girthed tie the string surcingle over the saddle; besides holding the reins, it now prevents the flaps flying up.

From Hints on Horsemanship, to a Nephew and Niece or, Common Sense and Common Errors in Common Riding by George Greenwood